United States officials say that they have imagery that shows an Iranian naval boat removing an unexploded mine from one of the tankers involved in the Gulf attack.

Officials have not released the video and photos of the incident. However, they claim that the imagery shows an Iranian boat moving alongside one of the stricken tankers and removing an unexploded limpet mine from its hull. The official said the imagery shows a person on board that small boat grabbing the unexploded mine.

The boat reportedly made the move even while the USS Bainbridge had been at the scene for hours and had a drone overhead. It is unclear if the imagery will be released to the public.

Iran’s mission to the UN “categorically rejects” the U.S. claims that they were responsible for the attacks.